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Describe single-replacement and double-replacement reactions.
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- d + ce ® c + de
- (element d is the ionic compound)
- (c is the positively charged ions)
- (e is the negatively charged ions)
- It is called a single replacement because it looks like d is replacing c
Middle School Teacher
A single placement reaction occurs when two elements are combined creating an oxidation reduction type of reaction. It is also called a single displacement reaction. In the process an ionic compound reacts with a free element to create a different ionic compound.
In a Double Placement Reaction occurs when two ionic compounds are mixed together. The ionic compounds split apart separating their anions and cations. A checmical reaction occurs resulting in a product that can ot be reversed/separated.
Posted by mkcapen1 on December 22, 2009 at 10:28 PM (Answer #1)
When a single replacement reaction takes place, the element that is separate to the compound would combine with the opposite element of the compound that its getting added to.
AX + Y = AY +X
On the reactant side, y is the opposite of x. Let's suppose that the equation is
2Ag + CuSO4 = Ag2SO4 +CU
Ag has a positive charge because it is a metal
SO4 is a negative ion, it's sulfate. They combine because they are opposite and combine to make a compound. Cu becomes separate.
Double replacement based on the same concept. Except that the reactant has two compounds instead of one. The same concept applies, the positive element combines with the negative element on the seocnd compound. And the negative compound combines with the positive of the second.
2NaI + CaCL2 = 2NaCl + CaI
Na (positive) would combine with cl (the negative element in CaCL2)
I (negative) would combine with Ca (positive)
Posted by maria-vivanco on January 17, 2014 at 3:15 PM (Answer #2)
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A + BX ---> B + AX
Element, compound, element, compound
AX + BY ---> BX + AY
Compound, Compound, Compound, Compound
Posted by Yojana_Thapa on January 25, 2014 at 11:18 PM (Answer #3)
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Posted by parama9000 on January 26, 2014 at 12:46 PM (Answer #4)
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